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MDSD BOARD DIAGNOSTICS
1.
Start engine from the platform control console and select LOW RPMs.
2.
Fully retract the telescopic boom sections and lower the main boom below horizontal.
3.
Locate EDA and MDSD boards in base control cabinet.
4.
Depress and hold the foot switch.
5.
Using a Volt\Ohm meter, measure voltage at terminal 1 on MDSD board and a good chassis ground. A
minimum of 12 volts should be present. Repair wiring if no voltage present.
6.
Using a Volt\Ohm meter, measure voltage at terminal 1 and terminal 2 on MDSD board. A minimum of 12
volts should be present. Repair wiring if no voltage present.
7.
Check fuse on MDSD board. Replace if blown.
8.
Using a Volt\Ohm meter, measure voltage at terminal "L" on EDA board and a good chassis ground. Record
reading.
9.
Measure voltage at terminal 11 on MDSD board and a good chassis ground. It should read 1/2 the voltage
measured at terminal "L" on EDA board. If no voltage present, refer to section 4 page 16 For "No drive" trouble
in electrical trouble shooting.
10.
Measure voltage at terminal 10 on MDSD board and a good chassis ground. It should read the same voltage
measured at terminal 11 on MDSD board. If readings are not the same voltage, adjust drive joystick
potentiometer until reading is the same voltage at terminal 11 on MDSD board. If no voltage present, refer to
section 4 page 16 for "No drive" trouble in electrical trouble shooting.
11.
Using a Volt\Ohm meter, measure voltage at terminal 10 on MDSD board, while the joystick is stroked forward
and reverse. In forward the voltage on terminal 10 will increase. In reverse it will decrease. In both cases the
increase or decrease should be smooth. If reading is erratic in either direction, replace drive joystick
potentiometer.
12.
Locate and remove wire 16 from terminal 4 on MDSD board.
13.
Using a Volt\Ohm meter set on ohms scale, check continuity between wire 16 and terminal 3 on MDSD board.
If continuity present continue to step 14. If no continuity present, refer to section 4 page 18 under "No Drive
Forward" in electrical troubleshooting.
14.
Install a Volt\Ohm meter with a milliampere scale between terminal 4 and wire 16.
15.
Move drive joystick in the forward direction. It should read approximately 400ma as joystick is at threshold
and increase as joy stick is moved farther. If there is no reading, replace MDSD board. If reading is low,
perform MDSD adjustments. Refer to Page 8 in this section for adjustment procedures.
16.
Remove meter from MDSD board and reinstall wire 16 to terminal 4.
17.
Locate and remove wire 15 from terminal 6 on MDSD board.
18.
Using a Volt\Ohm meter set on ohms scale, check continuity between wire 15 and terminal 5 on MDSD board.
If continuity present continue to step 19. If no continuity present, refer to section 4 page 18 under "No Drive
Reverse" in electrical trouble shooting.
19.
Install a Volt\Ohm meter with a milliampere scale between terminal 6 and wire 15.
20.
Move drive joystick in the reverse direction. It should read approximately 400ma as joystick is at threshold
and increase as joy stick is moved farther. If there is no reading, replace MDSD board. If reading is low,
perform MDSD adjustments. Refer to Page 8 in this section for adjustment procedures.
21.
Remove meter from MDSD board and reinstall wire 15 to terminal 6.
SJKB-40-D, SJKB-40-D/F
JUN. 1999
SECTION 5, Page 7
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